spring ResourceUrlProviderExposingInterceptor 源码
spring ResourceUrlProviderExposingInterceptor 代码
文件路径：/spring-webmvc/src/main/java/org/springframework/web/servlet/resource/ResourceUrlProviderExposingInterceptor.java
/*
* Copyright 2002-2020 the original author or authors.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* https://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.springframework.web.servlet.resource;
import jakarta.servlet.http.HttpServletRequest;
import jakarta.servlet.http.HttpServletResponse;
import org.springframework.util.Assert;
import org.springframework.web.bind.ServletRequestBindingException;
import org.springframework.web.servlet.HandlerInterceptor;
/**
* An interceptor that exposes the {@link ResourceUrlProvider} instance it
* is configured with as a request attribute.
*
* @author Rossen Stoyanchev
* @since 4.1
*/
public class ResourceUrlProviderExposingInterceptor implements HandlerInterceptor {
/**
* Name of the request attribute that holds the {@link ResourceUrlProvider}.
*/
public static final String RESOURCE_URL_PROVIDER_ATTR = ResourceUrlProvider.class.getName();
private final ResourceUrlProvider resourceUrlProvider;
public ResourceUrlProviderExposingInterceptor(ResourceUrlProvider resourceUrlProvider) {
Assert.notNull(resourceUrlProvider, "ResourceUrlProvider is required");
this.resourceUrlProvider = resourceUrlProvider;
}
@Override
public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler)
throws Exception {
try {
request.setAttribute(RESOURCE_URL_PROVIDER_ATTR, this.resourceUrlProvider);
}
catch (ResourceUrlEncodingFilter.LookupPathIndexException ex) {
throw new ServletRequestBindingException(ex.getMessage(), ex);
}
return true;
}
}
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